/*! ========================================================================
** Extended Template and Library
** Win32 Clock Description Implementation
**
** Copyright (c) 2002 Robert B. Quattlebaum Jr.
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** General Public License for more details.
**
** === N O T E S ===========================================================
**
** This is an internal header file, included by other ETL headers.
** You should not attempt to use it directly.
**
** ========================================================================= */

#ifndef __ETL__CLOCK_WIN32HPCOUNT_H
#define __ETL__CLOCK_WIN32HPCOUNT_H

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#if defined(__GNUG__) && defined(__int64)
#undef __int64
#define __int64 long long int
#endif

_ETL_BEGIN_NAMESPACE

class clock_desc_win32hpcount
{
public:
    typedef double value_type;

    static bool realtime()
    {
        return true;
    }

    static bool proctime()
    {
        return false;
    }

    static value_type
    one_second()
    {
        return 1.0f;
    }

    static value_type precision()
    {
        __int64 freq;
        QueryPerformanceFrequency((LARGE_INTEGER*)&freq);
        return one_second() / (value_type)freq;
    }

    static const char *description()
    {
        return "Win32 QueryPerformanceCounter()";
    };

protected:
    typedef __int64 timestamp;

    static void
    get_current_time(timestamp &x)
    {
        QueryPerformanceCounter((LARGE_INTEGER*)&x);
    }

    static timestamp
    get_current_time()
    {
        timestamp ret;
        QueryPerformanceCounter((LARGE_INTEGER*)&ret);
        return ret;
    }

    static value_type
    timestamp_to_seconds(const timestamp &x)
    {
        return precision() * x;
    }

    static timestamp
    seconds_to_timestamp(const value_type &x)
    {
        return (timestamp)(x / precision());
    }
};

_ETL_END_NAMESPACE

#endif